dt-bindings: display/msm: sm8150-mdss: add DP node

As Qualcomm SM8150 got support for the DisplayPort, add displayport@
node as a valid child to the MDSS node.

Fixes: 8880631 ("dt-bindings: display: msm: dp: declare compatible string for sm8150")
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Dmitry Baryshkov <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/586156/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Abhinav Kumar <[email protected]>

Author: lumag

Documentation/devicetree/bindings/display/msm/qcom,sm8150-mdss.yaml

@@ -53,6 +53,15 @@ patternProperties:
       compatible:
         const: qcom,sm8150-dpu
 
+  "^displayport-controller@[0-9a-f]+$":
+    type: object
+    additionalProperties: true
+
+    properties:
+      compatible:
+        contains:
+          const: qcom,sm8150-dp
+
   "^dsi@[0-9a-f]+$":
     type: object
     additionalProperties: true